check engine light YAMAHA WHY 50 2004 Owners Manual

3
INSTRUMENT AND CONTROL FUNCTIONS
PUSH
OPEN
ZAUM0253
EAU00029
Main switch/steering lock
The main switch/steering lock controls
the ignition and lighting systems, and
is used to lock the steering. The various
positions are described below.
EAU00038
OFF “”
All electrical systems are off. The key
can be removed.
EAU04470
CHECK “”
The 2-stroke engine oil level warning
light should come on. See page 3-2 for
an explanation of the engine oil level
warning light.
EAU00040
LOCK “ ”
The steering is locked, and all electrical
systems are off. The key can be
removed.
To lock the steering
1. Turn the handlebars all the way to
the left.
2. Push the key in from the “
”
position, and then turn it to “
”
while still pushing it.
3. Remove the key.
To unlock the steering
Push the key in, and then turn it to “
”
while still pushing it.
EW000016
Never turn the key to “ ” or “ ”
while the scooter is moving, otherwise
the electrical systems will be switched
off, which may result in loss of control
or an accident. Make sure that the scoo-
ter is stopped before turning the key
to “ ” or “ ”.
EAU04384
ON “ ”
All electrical circuits are supplied with
power, the taillight and meter lighting
come on, and the engine can be
started. The key cannot be removed.
NOTE :
The headlight comes on as soon as the
engine is started.
3-1

INSTRUMENT AND CONTROL FUNCTIONS
312ZAUM0184
1. Turn signal indicator light ""
2. High beam indicator light "
`"
EAU00057
Turn signal indicator light ""
This indicator light flashes when the
turn signal switch is pushed to the left
or right.
EAU00063
High beam indicator light ""
This indicator light comes on when the
high beam of the headlight is switched
on.
1
ZAUM0357
1. Oil level indicator light ""
EAU02958
Oil level warning light ""
This warning light comes on when the
key is in the "
" position or when the
oil level in the 2-stroke engine oil tank
is low during operation. If the warning
light comes on during operation, stop
immediately and fill the oil tank with
Yamalube 2 or equivalent 2-stroke
engine oil of either JASO grade "FC"
or ISO grades "EG-C" or "EG-D". The
warning light should go off after the 2-
stroke engine oil tank has been refilled.
NOTE :
If the warning light does not come on
when the key is in the "
" position or
does not go off after the 2-stroke engine
oil tank has been refilled, have a
Yamaha dealer check the electrical cir-
cuit.
EC000000
Do not operate the scooter until you
know that the engine oil level is
sufficient.
3-2
EAU03034
Indicator and warning lights

OPERATION AND IMPORTANT RIDING POINTS
5
EAU01118
EW000129
•Become thoroughly familiar
with all operating controls and
their functions before riding.
Consult a Yamaha dealer
regarding any control or
function that you do not
thoroughly understand.
•Never start the engine or
operate it in a closed area for
any length of time. Exhaust fu-
mes are poisonous, and
inhaling them can cause loss of
consciousness and death
within a short time. Always
make sure that there is
adequate ventilation.
•For safety, always start the
engine with the centerstand
down.
EAU02960
Starting the engineEC000046
See page 5-4 for engine break-in ins-
tructions prior to operating the
vehicle for the first time.
1. Turn the key to "
", and when the
oil level warning light comes on,
turn it to "
".EC000045
If the oil level warning light does not
come on, have a Yamaha dealer
check the electrical circuit.
2. Close the throttle completely.3. While applying the front or rear
brake, start the engine by pushing
the start switch or by pushing the
kickstarter lever down.
NOTE :
If the engine fails to start by pushing
the start switch, release the switch, wait
a few seconds, and then try again. Each
starting attempt should be as short as
possible to preserve the battery. Do not
crank the engine more than 5 seconds
on any one attempt. If the engine does
not start with the starter motor, try using
the kickstarter.
ZAUM0367
PUSH
OPEN
ZAUM0253
5-1

PERIODIC MAINTENANCE AND MINOR REPAIR
6
ZAUM0370
EAU01777
Removing and installing the
panel
The panel shown above needs to be
removed to perform some of the main-
tenance jobs described in this chapter.
Refer to this section each time the pa-
nel needs to be removed and installed.
1
ZAUM0369
1. Panel A
EAU01651
Checking the spark plug
The spark plug is an important engine
component, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode,
it should be removed and checked in
accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can
reveal the condition of the engine.
The porcelain insulator around the
center electrode of the spark plug
should be a medium-to-light tan (the
ideal color when the scooter is ridden
normally). If the spark plug shows a
distinctly different color, the engine
could be defective. Do not attempt to
diagnose such problems yourself.
Instead, have a Yamaha dealer check
the scooter.
6-5
EAUM0095
Panel A
To remove the panel
1. Open the seat. (See page 3-8 for
seat opening and closing
procedures.)
2. Remove the panel by pulling it up
as shown.
To install the panel
1. Insert the rear of the panel in the
original position, and then push
the front of the panel inward..
2. Close the seat.